virtio_intr_alloc
error = virtio_intr_alloc(sc->vtballoon_dev, &cnt, use_config, NULL);
error = virtio_intr_alloc(sc->vtblk_dev, &cnt, 0, cpus);
error = virtio_intr_alloc(sc->vtnet_dev, &cnt, use_config,
error = virtio_intr_alloc(sc->vtscsi_dev, &cnt, 0, sc->vtscsi_cpus);
int virtio_intr_alloc(device_t dev, int *cnt, int use_config, int *cpus);